Ok. Let's try something. I open my laptop. I open a new safari window. It takes < 1 second. I bring iTunes up. instantaneous. My point is, it can't get faster. However, it felt like I was waiting for my computer to open a new Safari window, or bring up iTunes. to me, that is slower. When I have no need for Snow Leopard and only dislike for its new "features", I don't see any reason for using it.
If you want more proof, I'll gladly take a video and show you my MBP in action, running both 10.5 and 10.6 on an external drive, for you to compare.
Well if they are from external drives there may be a slowdown there. But to each their own. If you don't want to use 10.6 nobody should tell you you're wrong.